Pick a turret not currently in use and hop in it. Stonevault Ruffians and Goons spawn from all directions. Ruffians are fast movers, but hit for ~60 damage against the turret's 5757 health, but they die in a single hit. Ruffians take two kills, but move slowly to compensate. Keep moving. Top priority is the largest group that is closest to the turret. Each wave spawns progressively more troggs, but they despawn when the wave is cleared.

On complete:

Dr. Hieronymus Blam says: I suppose we'll just have to throw these away... WAIT! I think I'm having an idea.